http://news.bbc.co.uk/2/hi/uk_news/engl ... 194086.stm
An airport worker told the BBC the pilot on the Boeing 777 had said he had lost all power, and had been forced to glide the plane into land.
The worker also said the pilot had told him all the electronics had also failed.
"He said he had no warning - it just went," the worker added.
Transport Secretary Ruth Kelly said she was "relieved" there had been no serious injuries.
The plane involved is one of 43 Boeing 777s in BA's fleet. It is believed to be about six years old.